Measurement of solidified lubricant's density hysteresis by pressure and temperature under high pressure

根据研究计划，本文的主要研究成果概括如下：（1）通过对压力室形状的建模、高压折射率假设和甲醇标定实验，建立了润滑油高压体积的评价方法。(2)准静态高压体积的测量结果表明，大环分子结构的润滑油，如牵引油（SN 100，CVT油）压缩小于那些链状结构，如甲醇和二酯DOS。(3)在几分钟的快速压缩下，体积变化在2GPa下为5%，在5GPa下为10%，比SN 100的准静态压缩小。实验结果证实了非平衡压缩时，由于剪切应力的出现，凝固润滑剂难以压缩的预言。(4)快速压片后，将温度升高至160℃并保持数小时，然后缓慢冷却至室温， ...更多信息 d则体积趋于准静态体积。这一结果证实了非平衡态接近平衡态的预言，类似于退火。(5)几分钟的快速压缩完成了高达5 GPa的DOS。体积变化被发现是几乎相同的准静态压缩。结果表明，即使在准静态压缩条件下，凝固态DOS也可能处于非平衡状态。(6)不同润滑剂的分子结构和固化压力对压力和温度滞后的影响不同。(7)建立了包含体积粘度的压缩速度依赖型粘弹性状态方程。实际计算是复杂的。而数学自动处理软件的使用，使计算变得方便。(8)未列入研究计划的另一项成果是200℃下高达2GPa的高压粘度测量和油固化高压牵引曲线分析。少

Abstracts of this research results are outlined as follows considering research schedule :(1) Evaluation method of high pressure volume of lubricant was established by modeling the pressure chamber shape, by the assumption of high pressure refractive index and by calibration experiment for methanol. (2) Measurement of quasi-static high pressure volume resulted that lubricants of bulky-ring molecular structure such as traction oils (SN100, CVT oil) compressed less than those of chain structure such as methanol and a diester DOS. (3) At a few minutes fast compression, the volume change was revealed to be 5 % at 2 GPa and 10 % at 5 GPa smaller than those of quasi-static compression for SN100. The results are the evidences of the prediction that solidified lubricants is hard to compress due to the appearance of shear stress in non equilibrium compression. (4) After fast compression, temperature was elevated up to 160℃ and maintained for a few hours and cooled slowly to room temperature, an … More d then the volume turned out to approach quasi-static one. This result proved the prediction that non equilibrium state approach equilibrium one similar to annealing. (5) A few minutes fast compression was done up to 5 GPa for DOS. The volume change was revealed to be almost the same as that of quasi-static compression. The result was out of the prediction and showed the possibility of non equilibrium state for solidified DOS even at quasi-static compression. (6) Hysteresis by pressure and temperature was different for molecular structure and solidified pressure of each lubricant. (7) Compression velocity-dependent viscoelastic equation of state including volume viscosity was established. Practical calculation is complicated. However, the employment of mathematical auto-processing software facilitate the calculation. (8) Another results not listed in the research schedule were high pressure viscosity measurements up to 2 GPa at 200℃ and the analysis of oil-solidified high pressure traction curve. Less